Threat Description

Rogue: ​W32/Renos


Category: Malware
Type: Rogue
Platform: W32
Aliases: Rogue:​W32/Renos, Trojan.Renos, Trojan-Downloader:​w32/renos.gen!c


Dishonest antivirus software which tricks users into buying or installing it, usually by infecting a user's computer, or by pretending the computer is infected.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.


You may wish to refer to the Support Community for further assistance. You may also refer to General Removal Instructions for a general guide on alternative disinfection actions.

Manual Disinfection

In certain circumstances, F-Secure Anti-Virus may not be able to automatically remove files; the user must manually select the correct disinfection action before the antivirus program will proceed.

If a file detected as not-virus:Hoax.Win32.Renos is an executable with a DLL or EXE extension, and is located in Windows, Windows System or in a root folder of C: drive, this file can be safely deleted or renamed.

Technical Details

Rogue:W32/Renos is program that displays annoying fake security warnings. The aim of this software is to trick a computer user to download third-party cleaning utilities, usually anti-spyware scanners.


The Renos executable file is usually dropped by malicious websites onto the computer system. It may also be delivered in the payload of a trojan.

Typically when a Renos' executable file is run, it drops a DLL file into Windows System folder and registers it as a system component. The DLL is the main Renos component.


When active, Renos shows a blinking icon in System Tray and periodically (actually quite often to be annoying) shows a fake security warning:

When a user clicks on this alert, his web browser is redirected to a website that offers a cleaning utility (usually anti-adware) for download.


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